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TM 1-1740-221-13&P&P
MAINTENANCE ALLOCATION CHART (MAC) INTRODUCTION - (CONTINUED)
NOTE
The following deinitions are applicable to the "repair" maintenance function:
Services. Inspect, test, service, adjust, align, calibrate, and/or replace.
Fault location/troubleshooting. The process of investigating and detecting the cause of
equipment malfunctioning; the act of isolating a fault within a system or Unit Under Test (UUT).
Disassembly/assembly. The step-by-step breakdown (taking apart) of a spare/functional
group coded item to the level of its least component, that is assigned an SMR code for the level
of maintenance under consideration (i.e., identiied as maintenance signiicant).
Actions. Welding, grinding, riveting, straightening, facing, machining, and/or resurfacing.
11. Overhaul. That maintenance effort (service/action) prescribed to restore an item to a completely
serviceable/operational condition as required by maintenance standards in appropriate technical publications.
Overhaul is normally the highest degree of maintenance performed by the Army. Overhaul does not normally return
an item to like new condition.
12. Rebuild. Consists of those services/actions necessary for the restoration of unserviceable equipment to a
like new condition in accordance with original manufacturing standards. Rebuild is the highest degree of material
maintenance applied to Army equipment. The rebuild operation includes the act of returning to zero those age
measurements (e.g., hours/miles) considered in classifying Army equipment/components.
Explanation Of Columns In The MAC
Column (1) Group Number. Column (1) lists Functional Group Code (FGC) numbers, the purpose of which is to
identify maintenance signiicant components, assemblies, subassemblies, and modules with the Next Higher
Assembly (NHA).
Column (2) Component/Assembly. Column (2) contains the item names of components, assemblies,
subassemblies, and modules for which maintenance is authorized.
Column (3) Maintenance Function. Column (3) lists the functions to be performed on the item listed in column (2).
(For a detailed explanation of these functions refer to "Maintenance Functions" outlined above.)
Column (4) Maintenance Level. Column (4) speciies each level of maintenance authorized to perform each function
listed in column (3), by indicating work time required (expressed as man hours in whole hours or decimals) in the
appropriate sub-column. This work time igure represents the active time required to perform that maintenance
function at the indicated level of maintenance. If the number or complexity of the tasks within the listed maintenance
function varies at different maintenance levels, appropriate work time igures are to be shown for each level. The
work time igure represents the average time required to restore an item (assembly, subassembly, component,
module, end item, or system) to a serviceable condition under typical ield operating conditions. This time includes
preparation time (including any necessary disassembly/assembly time), troubleshooting/fault location time, and
quality assurance time in addition to the time required to perform the speciic tasks identiied for the maintenance
functions authorized in the MAC. The symbol designations for the various maintenance levels are as follows:
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